The best material for the core of the primary and secondary coils of an induction coil is
A
copper, because it has a good conductor of electricity
B
steel, because it becomes magnetic and retains its magnetism for a long time
C
rubber, because it is a good insulator and the user is prevented from shock
D
soft iron, because it becomes magnetic but easily loses its magnetism
E
glass, because it is transparent
Verified Correct Answer: D.
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #29120)